Optimal power collection control method and apparatus in solar photovoltaic power generation system

Abstract

A control apparatus controls an optimizer that steps up a DC input voltage from a solar photovoltaic power generation panel to a predetermined DC high voltage and converts the stepped-up DC voltage into a grid connection voltage, and includes a microprocessor; a sensor group; and a MOS driver group. The microprocessor includes: a control logic unit; a maximum power point tracking control unit; a PWM control unit; a PFM control unit; an I / O port; a timer control unit; and an initial measurement unit. The sensor group includes a solar photovoltaic panel voltage detection circuit; a solar photovoltaic panel current detection circuit; an optimizer output voltage detection circuit; and an optimizer output current detection unit. Thus, even when the solar photovoltaic power generation panel is at a low power in a low output state, stable operation can be continued, and transistors can be protected from a surge voltage.

Description

RELATED APPLICATIONS[0001]The present application is National Phase of International Application No. PCT / JP2015 / 073833 filed Aug. 25, 2015, and claims priority from Japanese Application No. 2014-181499, filed Sep. 5, 2014, the disclosure of which is hereby incorporated by reference herein in its entirety.TECHNICAL FIELD[0002]The present invention relates to a power generation system through use of a solar photovoltaic panel and, in particular, to an optimal power collection control method and apparatus in a solar photovoltaic power generation system that can stably harvest generated power by optimizing power output from a solar photovoltaic panel with large output variation.BACKGROUND ART[0003]Along with diversification of energy resources, power generation through use of a solar photovoltaic panel has become widespread as a type of renewable energy. Against the backdrop of lack of energy sources and reduction in CO2 emission in recent years, large-scale solar photovoltaic power gen...

AI Technical Summary

Benefits of technology

The present invention provides an optimal power collection control apparatus for solar photovoltaic power generation systems. The apparatus can automatically adjust the voltage to prevent damage to circuit components and ensure stable operation even with variations in solar panel output. It uses both pulse frequency modulation and pulse width modulation controls to optimize power collection. The apparatus helps to stabilize the operation at low power levels and ensures stable operation of the entire system even with changes in optical energy. It also prevents surge voltage and breakage of switching transistors, resulting in improved efficiency and reliability of solar photovoltaic power generation systems.

Problems solved by technology

Connection of a load in a state with a high internal impedance reduces the voltage, which prevents normal operation as a power source, and the power source becomes an unstable power source.

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